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Cash and Investments (Gross Unrealized Losses) (Details) - USD ($)
$ in Thousands
Dec. 28, 2018
Dec. 29, 2017
Fair Value    
In an Unrealized Loss Position Less than 12 Months $ 271,358 $ 154,357
In an Unrealized Loss Position 12 Months or Greater 48,809 22,698
Total 320,167 177,055
Gross Unrealized Losses    
In an Unrealized Loss Position Less than 12 Months (623) (319)
In an Unrealized Loss Position 12 Months or Greater (260) (45)
Total (883) (364)
Corporate bonds    
Fair Value    
In an Unrealized Loss Position Less than 12 Months 236,162 140,746
In an Unrealized Loss Position 12 Months or Greater 39,627 20,047
Total 275,789 160,793
Gross Unrealized Losses    
In an Unrealized Loss Position Less than 12 Months (606) (296)
In an Unrealized Loss Position 12 Months or Greater (251) (36)
Total (857) (332)
U.S. Treasury and government sponsored enterprises    
Fair Value    
In an Unrealized Loss Position Less than 12 Months 28,105 13,611
In an Unrealized Loss Position 12 Months or Greater 9,182 2,651
Total 37,287 16,262
Gross Unrealized Losses    
In an Unrealized Loss Position Less than 12 Months (16) (23)
In an Unrealized Loss Position 12 Months or Greater (9) (9)
Total (25) $ (32)
Commercial paper    
Fair Value    
In an Unrealized Loss Position Less than 12 Months 7,091  
In an Unrealized Loss Position 12 Months or Greater 0  
Total 7,091  
Gross Unrealized Losses    
In an Unrealized Loss Position Less than 12 Months (1)  
In an Unrealized Loss Position 12 Months or Greater 0  
Total $ (1)